Grease gun and cartridge therefor



' 1,489,262 c. w. MARTIN GREASE GUN AND CARTRIDGE-THEREFOR Filed Sept; 13 1921 WITNESS.

' Patented Apr. '8, 1924.

umrao STATES rnran r err-ice.

GARY W. MARTIN, OF SAN FRANCISCO, CALIFQBRIA, ASSIGNOB TO OREN G. EH8,

OFSANFRAHC'IBCQCALIFOBNIA.

GREASE GUN AND CARTRIDGE THEREFOR.

Application filed September 18, 1921. Serial No. 500,849.

cisco, State of California, have invented.

a new and useful Grease Gun and Cartrid e Therefor, of which the following is a specication.

his invention relates to lubricating apparatus and more particularly to thattyEe of apparatus involving a grease gun which a lubricant can be ejected with eat pressure from the gun into grease receiving cavities and receptacles.

It is an object of the present invention to l provide a cartridge-like container of such proportions and dimensions, that when loaded with a lubricant, it can be readily arran ed within the barrel of a grease gun as whereliy, when the gun parts are properly manipulated, the lubricant can be forced from its cartridge. A further object of the invention is to provide a cartridge having a temporary stopper or closure in the discharge end of the cartridge, and to provide at the opposite end thereof a movable head or piston-like part which is firmly hut movably mountedin its respective end of t the cartrid e shell to form the normal closao are thereo It is a further object to provide a movable end closure which, while normally having a suhstantially liquidtigh-t joint in its end of the she may be shifted bodilv longitudinally in the shell of the cartridge to cause the expression of the liquid or lubricant therefrom.

Another object of the invention is to provide an improved grease n having parts designed to co-operate wit no tridge loaded with a luhricant or other substance to he ejected.

It is a, further oloject to provide for a slight retraction of t e piston part to relieve the apparatus oiipressure when it is to be disconnected from the element that is heing served with a lubricant.

"The invention possessw other objects and features of advantage, some of which, with the foregoing, will he made manifest in the following description of the preferred form oil the invention, which is illustrated in the drawings accompanying and 111"; part of the specification. lt is tobe understood that 'it'is not intended to limit the invention to the embodiment shown by the id piston.

an inserted car-- drawings and description, as variations may be adopted within the scope of the invention as set forth in the claims.

Fig. 1 is a central longitudinal section of. the improved grease gunparts bein shown in elevation, and in which is mounte the improved cartridge.

Fig. 2 is a perspective of the grease gun cartridge.

Fig. 3 is a sectionaldetail showing the movable head of the cartridge in the end closing position.

Fig. 4 is a plan of the outer side of the Fig. 5 is an edge view of the piston.

Fig. 6 is a section of the assembled pistonand packing. i

The device of thepresent invention consists of a cartridge having a. shell of suitable proportions and of any desired kind of material and which shell is adapted to be mounted, when loaded, in the barrel of a grease gun of the type having a jackscrew V operative to react against ,a movable head of the cartridge whereby, under the pressure 89 of the screw against the head. the contents of the cartridge may he ejected through the discharge device or nozzle of the gun. From this it will be seen that it is entirely unnecessary to directly charge the grease into the gun barrel, as is usually the case, and, further, itwill be seen that a charge of geese can be contained, in a given nantity, in a unit or cartridge-like device, t erefore entirely overcoming the handlingoi? the grease or other fluid in bulk condition and avoiding the usual waste incident theretill An embodiment of the invention is shown as including a cartrid in the .form ole cylindrical shell 2, which may he of thin sheet metal or any 7. other saitahlematerialwhich is preferahly im envious. to the, content of the cartridge. e end of the cartridge may he peanently closed and rovided with a smell nipple or neclr 8 into which is a simple stopev d, which is to he removed and dieoarde when the cartrid is to he utilized, is lie-ins. designed. heopp osite and ol'the cartridge is provided with a movable headin the dorm or a disc 5. The disc 5 is desied to he to inwardly into the shell and when so 'N-Il inwardly, forms a piston for electmg the contenm through the neclx- 3 of the m cartridge. If desired, the piston or head may beprovided with a; cup washer 6, which, in the present instance, is shown as fastened by inwardly bent prongs 7 of the head 5; the washer thus forming a liquid-tight joint at the perimeter of the piston head 5.

The cartridge, when loaded, is desi ed to be introduced into a grease gun 'othe type. having, for instance, a cylindrical barrel 10, having a fixed discharge head 11, which is centrally perforated, as at 12, to receive a threaded connection 13 of a flexible nozzle or tube 142, having a ti 15 to be applied to the part to be supp ied with the lubricant, or other contents from the cartridge 2. The other end of the barrel 10 is shown as threaded as at 10*, and receives a removable cap 16 interiorly threaded to fit the threads and which cap may be provided with an interior cylindrical wall 17 to extend slightly within the adjacent end of the barrel 10. V

The gun is provided with a jack or'pressure screw 18, havin a suitable handle or wheel 19 and is three ed through the central boss 16* of the cap 16. The inner end of the jack-screw 18 is provided with a head 20 or other suitable means designed to engage the contiguous faoe of the piston 5 of the cartridge. When the cartridge 1Sl11- sorted in the gun while its cap 16 is removed, the neck 3 or the cartridge bears against the end wall 11 and surrounds the outlet aperture 12, thereof.

It is desirable to provide means for slightly retracting, as wellas pushing, the piston, as to reduce pressure on the con-- tents of the gun before the nozzl' is dis connected from the part being charged with grease. To that end the screw head 20 is designed to interlock with the piston. This latter is provided with a complementary means, such as upset, opposite lugs 9. The head'20 of the screw can be slipped edgiwise between the lugs 9 and by turning t e "screw 18, the head 20 thereof, moves inwardly and engages the piston 5. After the headand piston are interlocked, the cap 16 is applied to the shell 10. Rotation of the screw and inward movement of the head 20 causes the'latter to push the piston 5 from its end closing'position in the cartridge, shown in Fig. 3. During such inword movement of the piston, the contents.

. of the cartridge is ejected through its neck 3 into and from the discharge tube 14.

Since considerable pressure is devel in the gun when'sorving, it is the piston be backed ofi slightly to lower pressure when the nozzle 15 is to be detached. It is therefore, only necesary to retract the screw-head 20 and thereby allow the piston to fall back a short distance. The piston may be pulled back by the screw and its head. I

If the lugs 9 and the prongs 7 are punched up from the disc or piston 5, the holes are preferably covered by a guard o plate 5*, which prevents the packing 6 from bulging into the holes. 4 r

Preferably, there is a' washer 21 introduced between the discharge end of the cartridge shell and the barrel of the as to prevent the escape of the fluid under gun so.

pressure from around the circumference of the shell.

What is claimed is; i 1. A cartridge adapted to be inserted in a grease gun, comprising a shell, a movable end wall in the shell adapted to be moved by the pressure applying means of the gun to eject the grease from the cartridge and tongues on the end wall under which a foot on the pressure applying means is adapted to engage to transmit backward longitudinal movement of the pressure applying means to the end wall.

2. A cartridge adaptedto be inserted in a grease gun, comprisin a cylindrical shell entirely open at one on an inwardly movable metallic piston closing said end, and

tonguesintegral with said piston and dis? posed 0n the outer face thereof adapted to be engaged by a pressure applying means to move the pistonoutwardly. 3. A cartridge adapted to be inserted in a grease gun having a jack screw for e'ectingv grease from the gun, comprising a s ell, an inwardly movable closure in one end of the shell and means on the outer face of the closure detachably engaging said screw whereby rotation of the screw /in either direction causes longitudinal movement of' theclosure.

4. .A cartridge adaptedto be inserted in a grease gun having a headed jackv screw for e'ecting grease from the gun, comprising a ell, an inwardly movable closure in one end of the'shell and means on the outer side of the closure underwhich the jack screw head is adapted to be slipped to detachably connect the closure to t e screw, whereby rotation of the screw in either direction causes longitudinal movement of the closure.

In testimony whereof, I have hereunto set my hand.

w fem 

